01 - Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
02 - In a medium bowl, whisk together almond flour, gluten-free flour, baking soda, and salt until evenly blended.
03 - Using an electric mixer, beat the softened butter and granulated sugar in a large bowl until pale and fluffy.
04 - Add egg, lemon zest, lemon juice, and vanilla extract to creamed butter mixture; beat until thoroughly combined.
05 - Add dry ingredient mixture to the wet ingredients, mixing until a soft dough forms.
06 - Portion tablespoon-sized amounts of dough, roll into balls, and arrange on prepared baking sheet, spacing about 2 inches apart. Gently flatten each ball slightly.
07 - Bake for 10–12 minutes until edges are lightly golden. Remove and allow cookies to cool completely on a wire rack.
08 - In a small bowl, whisk powdered sugar with 1 tablespoon lemon juice, adding additional juice drop by drop as needed until glaze is thick but pourable.
09 - Drizzle glaze over cooled cookies and allow to set before serving.